What is the difference between MockMvc and a real HTTP server test?

Separates full Spring MVC dispatch over mock Servlet objects from tests that cross an actual network and container boundary.

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TL;DR

MockMvc runs Spring MVC request handling with mock request and response objects, so it can test routing, argument resolution, validation, filters, security, controllers, exception handling, and serialization without starting a server. A real HTTP test starts the application on a port and sends an actual request with a client. That adds server startup, network encoding, connection behavior, and lower-level Servlet-container configuration.

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MockMvc, RANDOM_PORT, HTTP clients, servlet-container behavior, filters, serialization, and transport realism.

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Core answer
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Overview
MockMvc exercises Spring MVC deeply without opening a socket; real HTTP adds the server and transport boundary.
MockMvc runs Spring MVC request handling with mock request and response objects, so it can test routing, argument resolution, validation, filters, security, controllers, exception handling, and serialization without starting a server. A real HTTP test starts the application on a port and sends an actual request with a client. That adds server startup, network encoding, connection behavior, and lower-level Servlet-container configuration.
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Stronger answer
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MockMvc is faster and gives precise assertions, but it cannot prove every container, TLS, compression, proxy, or socket behavior. A @SpringBootTest using gives a real server, and the client must treat it as an external process boundary; its test transaction does not wrap server-side work. I use MockMvc for broad web-contract coverage and a smaller number of real HTTP tests for transport-sensitive and deployment-critical paths.

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Saying MockMvc is a live HTTP server.
Expecting a test transaction to roll back server work.
Using only real HTTP tests for every validation branch.

What is the difference between MockMvc and a real HTTP server test?

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